Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
new file mode 100644
index 0000000..1838029
--- /dev/null
+++ b/net/ipv6/route.c
@@ -0,0 +1,2131 @@
+/*
+ * Linux INET6 implementation
+ * FIB front-end.
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/* Changes:
+ *
+ * YOSHIFUJI Hideaki @USAGI
+ * reworked default router selection.
+ * - respect outgoing interface
+ * - select from (probably) reachable routers (i.e.
+ * routers in REACHABLE, STALE, DELAY or PROBE states).
+ * - always select the same router if it is (probably)
+ * reachable. otherwise, round-robin the list.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/times.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/route.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/init.h>
+#include <linux/netlink.h>
+#include <linux/if_arp.h>
+
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#endif
+
+#include <net/snmp.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/tcp.h>
+#include <linux/rtnetlink.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+/* Set to 3 to get tracing. */
+#define RT6_DEBUG 2
+
+#if RT6_DEBUG >= 3
+#define RDBG(x) printk x
+#define RT6_TRACE(x...) printk(KERN_DEBUG x)
+#else
+#define RDBG(x)
+#define RT6_TRACE(x...) do { ; } while (0)
+#endif
+
+
+static int ip6_rt_max_size = 4096;
+static int ip6_rt_gc_min_interval = HZ / 2;
+static int ip6_rt_gc_timeout = 60*HZ;
+int ip6_rt_gc_interval = 30*HZ;
+static int ip6_rt_gc_elasticity = 9;
+static int ip6_rt_mtu_expires = 10*60*HZ;
+static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
+
+static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
+static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
+static struct dst_entry *ip6_negative_advice(struct dst_entry *);
+static void ip6_dst_destroy(struct dst_entry *);
+static void ip6_dst_ifdown(struct dst_entry *,
+ struct net_device *dev, int how);
+static int ip6_dst_gc(void);
+
+static int ip6_pkt_discard(struct sk_buff *skb);
+static int ip6_pkt_discard_out(struct sk_buff *skb);
+static void ip6_link_failure(struct sk_buff *skb);
+static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
+
+static struct dst_ops ip6_dst_ops = {
+ .family = AF_INET6,
+ .protocol = __constant_htons(ETH_P_IPV6),
+ .gc = ip6_dst_gc,
+ .gc_thresh = 1024,
+ .check = ip6_dst_check,
+ .destroy = ip6_dst_destroy,
+ .ifdown = ip6_dst_ifdown,
+ .negative_advice = ip6_negative_advice,
+ .link_failure = ip6_link_failure,
+ .update_pmtu = ip6_rt_update_pmtu,
+ .entry_size = sizeof(struct rt6_info),
+};
+
+struct rt6_info ip6_null_entry = {
+ .u = {
+ .dst = {
+ .__refcnt = ATOMIC_INIT(1),
+ .__use = 1,
+ .dev = &loopback_dev,
+ .obsolete = -1,
+ .error = -ENETUNREACH,
+ .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
+ .input = ip6_pkt_discard,
+ .output = ip6_pkt_discard_out,
+ .ops = &ip6_dst_ops,
+ .path = (struct dst_entry*)&ip6_null_entry,
+ }
+ },
+ .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
+ .rt6i_metric = ~(u32) 0,
+ .rt6i_ref = ATOMIC_INIT(1),
+};
+
+struct fib6_node ip6_routing_table = {
+ .leaf = &ip6_null_entry,
+ .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
+};
+
+/* Protects all the ip6 fib */
+
+DEFINE_RWLOCK(rt6_lock);
+
+
+/* allocate dst with ip6_dst_ops */
+static __inline__ struct rt6_info *ip6_dst_alloc(void)
+{
+ return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
+}
+
+static void ip6_dst_destroy(struct dst_entry *dst)
+{
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ struct inet6_dev *idev = rt->rt6i_idev;
+
+ if (idev != NULL) {
+ rt->rt6i_idev = NULL;
+ in6_dev_put(idev);
+ }
+}
+
+static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
+ int how)
+{
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ struct inet6_dev *idev = rt->rt6i_idev;
+
+ if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
+ struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
+ if (loopback_idev != NULL) {
+ rt->rt6i_idev = loopback_idev;
+ in6_dev_put(idev);
+ }
+ }
+}
+
+static __inline__ int rt6_check_expired(const struct rt6_info *rt)
+{
+ return (rt->rt6i_flags & RTF_EXPIRES &&
+ time_after(jiffies, rt->rt6i_expires));
+}
+
+/*
+ * Route lookup. Any rt6_lock is implied.
+ */
+
+static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
+ int oif,
+ int strict)
+{
+ struct rt6_info *local = NULL;
+ struct rt6_info *sprt;
+
+ if (oif) {
+ for (sprt = rt; sprt; sprt = sprt->u.next) {
+ struct net_device *dev = sprt->rt6i_dev;
+ if (dev->ifindex == oif)
+ return sprt;
+ if (dev->flags & IFF_LOOPBACK) {
+ if (sprt->rt6i_idev == NULL ||
+ sprt->rt6i_idev->dev->ifindex != oif) {
+ if (strict && oif)
+ continue;
+ if (local && (!oif ||
+ local->rt6i_idev->dev->ifindex == oif))
+ continue;
+ }
+ local = sprt;
+ }
+ }
+
+ if (local)
+ return local;
+
+ if (strict)
+ return &ip6_null_entry;
+ }
+ return rt;
+}
+
+/*
+ * pointer to the last default router chosen. BH is disabled locally.
+ */
+static struct rt6_info *rt6_dflt_pointer;
+static DEFINE_SPINLOCK(rt6_dflt_lock);
+
+void rt6_reset_dflt_pointer(struct rt6_info *rt)
+{
+ spin_lock_bh(&rt6_dflt_lock);
+ if (rt == NULL || rt == rt6_dflt_pointer) {
+ RT6_TRACE("reset default router: %p->NULL\n", rt6_dflt_pointer);
+ rt6_dflt_pointer = NULL;
+ }
+ spin_unlock_bh(&rt6_dflt_lock);
+}
+
+/* Default Router Selection (RFC 2461 6.3.6) */
+static struct rt6_info *rt6_best_dflt(struct rt6_info *rt, int oif)
+{
+ struct rt6_info *match = NULL;
+ struct rt6_info *sprt;
+ int mpri = 0;
+
+ for (sprt = rt; sprt; sprt = sprt->u.next) {
+ struct neighbour *neigh;
+ int m = 0;
+
+ if (!oif ||
+ (sprt->rt6i_dev &&
+ sprt->rt6i_dev->ifindex == oif))
+ m += 8;
+
+ if (rt6_check_expired(sprt))
+ continue;
+
+ if (sprt == rt6_dflt_pointer)
+ m += 4;
+
+ if ((neigh = sprt->rt6i_nexthop) != NULL) {
+ read_lock_bh(&neigh->lock);
+ switch (neigh->nud_state) {
+ case NUD_REACHABLE:
+ m += 3;
+ break;
+
+ case NUD_STALE:
+ case NUD_DELAY:
+ case NUD_PROBE:
+ m += 2;
+ break;
+
+ case NUD_NOARP:
+ case NUD_PERMANENT:
+ m += 1;
+ break;
+
+ case NUD_INCOMPLETE:
+ default:
+ read_unlock_bh(&neigh->lock);
+ continue;
+ }
+ read_unlock_bh(&neigh->lock);
+ } else {
+ continue;
+ }
+
+ if (m > mpri || m >= 12) {
+ match = sprt;
+ mpri = m;
+ if (m >= 12) {
+ /* we choose the last default router if it
+ * is in (probably) reachable state.
+ * If route changed, we should do pmtu
+ * discovery. --yoshfuji
+ */
+ break;
+ }
+ }
+ }
+
+ spin_lock(&rt6_dflt_lock);
+ if (!match) {
+ /*
+ * No default routers are known to be reachable.
+ * SHOULD round robin
+ */
+ if (rt6_dflt_pointer) {
+ for (sprt = rt6_dflt_pointer->u.next;
+ sprt; sprt = sprt->u.next) {
+ if (sprt->u.dst.obsolete <= 0 &&
+ sprt->u.dst.error == 0 &&
+ !rt6_check_expired(sprt)) {
+ match = sprt;
+ break;
+ }
+ }
+ for (sprt = rt;
+ !match && sprt;
+ sprt = sprt->u.next) {
+ if (sprt->u.dst.obsolete <= 0 &&
+ sprt->u.dst.error == 0 &&
+ !rt6_check_expired(sprt)) {
+ match = sprt;
+ break;
+ }
+ if (sprt == rt6_dflt_pointer)
+ break;
+ }
+ }
+ }
+
+ if (match) {
+ if (rt6_dflt_pointer != match)
+ RT6_TRACE("changed default router: %p->%p\n",
+ rt6_dflt_pointer, match);
+ rt6_dflt_pointer = match;
+ }
+ spin_unlock(&rt6_dflt_lock);
+
+ if (!match) {
+ /*
+ * Last Resort: if no default routers found,
+ * use addrconf default route.
+ * We don't record this route.
+ */
+ for (sprt = ip6_routing_table.leaf;
+ sprt; sprt = sprt->u.next) {
+ if (!rt6_check_expired(sprt) &&
+ (sprt->rt6i_flags & RTF_DEFAULT) &&
+ (!oif ||
+ (sprt->rt6i_dev &&
+ sprt->rt6i_dev->ifindex == oif))) {
+ match = sprt;
+ break;
+ }
+ }
+ if (!match) {
+ /* no default route. give up. */
+ match = &ip6_null_entry;
+ }
+ }
+
+ return match;
+}
+
+struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
+ int oif, int strict)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt;
+
+ read_lock_bh(&rt6_lock);
+ fn = fib6_lookup(&ip6_routing_table, daddr, saddr);
+ rt = rt6_device_match(fn->leaf, oif, strict);
+ dst_hold(&rt->u.dst);
+ rt->u.dst.__use++;
+ read_unlock_bh(&rt6_lock);
+
+ rt->u.dst.lastuse = jiffies;
+ if (rt->u.dst.error == 0)
+ return rt;
+ dst_release(&rt->u.dst);
+ return NULL;
+}
+
+/* ip6_ins_rt is called with FREE rt6_lock.
+ It takes new route entry, the addition fails by any reason the
+ route is freed. In any case, if caller does not hold it, it may
+ be destroyed.
+ */
+
+int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr)
+{
+ int err;
+
+ write_lock_bh(&rt6_lock);
+ err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr);
+ write_unlock_bh(&rt6_lock);
+
+ return err;
+}
+
+/* No rt6_lock! If COW failed, the function returns dead route entry
+ with dst->error set to errno value.
+ */
+
+static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
+ struct in6_addr *saddr)
+{
+ int err;
+ struct rt6_info *rt;
+
+ /*
+ * Clone the route.
+ */
+
+ rt = ip6_rt_copy(ort);
+
+ if (rt) {
+ ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
+
+ if (!(rt->rt6i_flags&RTF_GATEWAY))
+ ipv6_addr_copy(&rt->rt6i_gateway, daddr);
+
+ rt->rt6i_dst.plen = 128;
+ rt->rt6i_flags |= RTF_CACHE;
+ rt->u.dst.flags |= DST_HOST;
+
+#ifdef CONFIG_IPV6_SUBTREES
+ if (rt->rt6i_src.plen && saddr) {
+ ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
+ rt->rt6i_src.plen = 128;
+ }
+#endif
+
+ rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
+
+ dst_hold(&rt->u.dst);
+
+ err = ip6_ins_rt(rt, NULL, NULL);
+ if (err == 0)
+ return rt;
+
+ rt->u.dst.error = err;
+
+ return rt;
+ }
+ dst_hold(&ip6_null_entry.u.dst);
+ return &ip6_null_entry;
+}
+
+#define BACKTRACK() \
+if (rt == &ip6_null_entry && strict) { \
+ while ((fn = fn->parent) != NULL) { \
+ if (fn->fn_flags & RTN_ROOT) { \
+ dst_hold(&rt->u.dst); \
+ goto out; \
+ } \
+ if (fn->fn_flags & RTN_RTINFO) \
+ goto restart; \
+ } \
+}
+
+
+void ip6_route_input(struct sk_buff *skb)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt;
+ int strict;
+ int attempts = 3;
+
+ strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
+
+relookup:
+ read_lock_bh(&rt6_lock);
+
+ fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr,
+ &skb->nh.ipv6h->saddr);
+
+restart:
+ rt = fn->leaf;
+
+ if ((rt->rt6i_flags & RTF_CACHE)) {
+ rt = rt6_device_match(rt, skb->dev->ifindex, strict);
+ BACKTRACK();
+ dst_hold(&rt->u.dst);
+ goto out;
+ }
+
+ rt = rt6_device_match(rt, skb->dev->ifindex, 0);
+ BACKTRACK();
+
+ if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
+ struct rt6_info *nrt;
+ dst_hold(&rt->u.dst);
+ read_unlock_bh(&rt6_lock);
+
+ nrt = rt6_cow(rt, &skb->nh.ipv6h->daddr,
+ &skb->nh.ipv6h->saddr);
+
+ dst_release(&rt->u.dst);
+ rt = nrt;
+
+ if (rt->u.dst.error != -EEXIST || --attempts <= 0)
+ goto out2;
+
+ /* Race condition! In the gap, when rt6_lock was
+ released someone could insert this route. Relookup.
+ */
+ dst_release(&rt->u.dst);
+ goto relookup;
+ }
+ dst_hold(&rt->u.dst);
+
+out:
+ read_unlock_bh(&rt6_lock);
+out2:
+ rt->u.dst.lastuse = jiffies;
+ rt->u.dst.__use++;
+ skb->dst = (struct dst_entry *) rt;
+}
+
+struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt;
+ int strict;
+ int attempts = 3;
+
+ strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
+
+relookup:
+ read_lock_bh(&rt6_lock);
+
+ fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src);
+
+restart:
+ rt = fn->leaf;
+
+ if ((rt->rt6i_flags & RTF_CACHE)) {
+ rt = rt6_device_match(rt, fl->oif, strict);
+ BACKTRACK();
+ dst_hold(&rt->u.dst);
+ goto out;
+ }
+ if (rt->rt6i_flags & RTF_DEFAULT) {
+ if (rt->rt6i_metric >= IP6_RT_PRIO_ADDRCONF)
+ rt = rt6_best_dflt(rt, fl->oif);
+ } else {
+ rt = rt6_device_match(rt, fl->oif, strict);
+ BACKTRACK();
+ }
+
+ if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
+ struct rt6_info *nrt;
+ dst_hold(&rt->u.dst);
+ read_unlock_bh(&rt6_lock);
+
+ nrt = rt6_cow(rt, &fl->fl6_dst, &fl->fl6_src);
+
+ dst_release(&rt->u.dst);
+ rt = nrt;
+
+ if (rt->u.dst.error != -EEXIST || --attempts <= 0)
+ goto out2;
+
+ /* Race condition! In the gap, when rt6_lock was
+ released someone could insert this route. Relookup.
+ */
+ dst_release(&rt->u.dst);
+ goto relookup;
+ }
+ dst_hold(&rt->u.dst);
+
+out:
+ read_unlock_bh(&rt6_lock);
+out2:
+ rt->u.dst.lastuse = jiffies;
+ rt->u.dst.__use++;
+ return &rt->u.dst;
+}
+
+
+/*
+ * Destination cache support functions
+ */
+
+static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
+{
+ struct rt6_info *rt;
+
+ rt = (struct rt6_info *) dst;
+
+ if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
+ return dst;
+
+ return NULL;
+}
+
+static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+
+ if (rt) {
+ if (rt->rt6i_flags & RTF_CACHE)
+ ip6_del_rt(rt, NULL, NULL);
+ else
+ dst_release(dst);
+ }
+ return NULL;
+}
+
+static void ip6_link_failure(struct sk_buff *skb)
+{
+ struct rt6_info *rt;
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
+
+ rt = (struct rt6_info *) skb->dst;
+ if (rt) {
+ if (rt->rt6i_flags&RTF_CACHE) {
+ dst_set_expires(&rt->u.dst, 0);
+ rt->rt6i_flags |= RTF_EXPIRES;
+ } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
+ rt->rt6i_node->fn_sernum = -1;
+ }
+}
+
+static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+ struct rt6_info *rt6 = (struct rt6_info*)dst;
+
+ if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
+ rt6->rt6i_flags |= RTF_MODIFIED;
+ if (mtu < IPV6_MIN_MTU) {
+ mtu = IPV6_MIN_MTU;
+ dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
+ }
+ dst->metrics[RTAX_MTU-1] = mtu;
+ }
+}
+
+/* Protected by rt6_lock. */
+static struct dst_entry *ndisc_dst_gc_list;
+static int ipv6_get_mtu(struct net_device *dev);
+
+static inline unsigned int ipv6_advmss(unsigned int mtu)
+{
+ mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
+
+ if (mtu < ip6_rt_min_advmss)
+ mtu = ip6_rt_min_advmss;
+
+ /*
+ * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
+ * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
+ * IPV6_MAXPLEN is also valid and means: "any MSS,
+ * rely only on pmtu discovery"
+ */
+ if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
+ mtu = IPV6_MAXPLEN;
+ return mtu;
+}
+
+struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
+ struct neighbour *neigh,
+ struct in6_addr *addr,
+ int (*output)(struct sk_buff *))
+{
+ struct rt6_info *rt;
+ struct inet6_dev *idev = in6_dev_get(dev);
+
+ if (unlikely(idev == NULL))
+ return NULL;
+
+ rt = ip6_dst_alloc();
+ if (unlikely(rt == NULL)) {
+ in6_dev_put(idev);
+ goto out;
+ }
+
+ dev_hold(dev);
+ if (neigh)
+ neigh_hold(neigh);
+ else
+ neigh = ndisc_get_neigh(dev, addr);
+
+ rt->rt6i_dev = dev;
+ rt->rt6i_idev = idev;
+ rt->rt6i_nexthop = neigh;
+ atomic_set(&rt->u.dst.__refcnt, 1);
+ rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
+ rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
+ rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
+ rt->u.dst.output = output;
+
+#if 0 /* there's no chance to use these for ndisc */
+ rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
+ ? DST_HOST
+ : 0;
+ ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
+ rt->rt6i_dst.plen = 128;
+#endif
+
+ write_lock_bh(&rt6_lock);
+ rt->u.dst.next = ndisc_dst_gc_list;
+ ndisc_dst_gc_list = &rt->u.dst;
+ write_unlock_bh(&rt6_lock);
+
+ fib6_force_start_gc();
+
+out:
+ return (struct dst_entry *)rt;
+}
+
+int ndisc_dst_gc(int *more)
+{
+ struct dst_entry *dst, *next, **pprev;
+ int freed;
+
+ next = NULL;
+ pprev = &ndisc_dst_gc_list;
+ freed = 0;
+ while ((dst = *pprev) != NULL) {
+ if (!atomic_read(&dst->__refcnt)) {
+ *pprev = dst->next;
+ dst_free(dst);
+ freed++;
+ } else {
+ pprev = &dst->next;
+ (*more)++;
+ }
+ }
+
+ return freed;
+}
+
+static int ip6_dst_gc(void)
+{
+ static unsigned expire = 30*HZ;
+ static unsigned long last_gc;
+ unsigned long now = jiffies;
+
+ if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
+ atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
+ goto out;
+
+ expire++;
+ fib6_run_gc(expire);
+ last_gc = now;
+ if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
+ expire = ip6_rt_gc_timeout>>1;
+
+out:
+ expire -= expire>>ip6_rt_gc_elasticity;
+ return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
+}
+
+/* Clean host part of a prefix. Not necessary in radix tree,
+ but results in cleaner routing tables.
+
+ Remove it only when all the things will work!
+ */
+
+static int ipv6_get_mtu(struct net_device *dev)
+{
+ int mtu = IPV6_MIN_MTU;
+ struct inet6_dev *idev;
+
+ idev = in6_dev_get(dev);
+ if (idev) {
+ mtu = idev->cnf.mtu6;
+ in6_dev_put(idev);
+ }
+ return mtu;
+}
+
+int ipv6_get_hoplimit(struct net_device *dev)
+{
+ int hoplimit = ipv6_devconf.hop_limit;
+ struct inet6_dev *idev;
+
+ idev = in6_dev_get(dev);
+ if (idev) {
+ hoplimit = idev->cnf.hop_limit;
+ in6_dev_put(idev);
+ }
+ return hoplimit;
+}
+
+/*
+ *
+ */
+
+int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr)
+{
+ int err;
+ struct rtmsg *r;
+ struct rtattr **rta;
+ struct rt6_info *rt = NULL;
+ struct net_device *dev = NULL;
+ struct inet6_dev *idev = NULL;
+ int addr_type;
+
+ rta = (struct rtattr **) _rtattr;
+
+ if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128)
+ return -EINVAL;
+#ifndef CONFIG_IPV6_SUBTREES
+ if (rtmsg->rtmsg_src_len)
+ return -EINVAL;
+#endif
+ if (rtmsg->rtmsg_ifindex) {
+ err = -ENODEV;
+ dev = dev_get_by_index(rtmsg->rtmsg_ifindex);
+ if (!dev)
+ goto out;
+ idev = in6_dev_get(dev);
+ if (!idev)
+ goto out;
+ }
+
+ if (rtmsg->rtmsg_metric == 0)
+ rtmsg->rtmsg_metric = IP6_RT_PRIO_USER;
+
+ rt = ip6_dst_alloc();
+
+ if (rt == NULL) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ rt->u.dst.obsolete = -1;
+ rt->rt6i_expires = clock_t_to_jiffies(rtmsg->rtmsg_info);
+ if (nlh && (r = NLMSG_DATA(nlh))) {
+ rt->rt6i_protocol = r->rtm_protocol;
+ } else {
+ rt->rt6i_protocol = RTPROT_BOOT;
+ }
+
+ addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst);
+
+ if (addr_type & IPV6_ADDR_MULTICAST)
+ rt->u.dst.input = ip6_mc_input;
+ else
+ rt->u.dst.input = ip6_forward;
+
+ rt->u.dst.output = ip6_output;
+
+ ipv6_addr_prefix(&rt->rt6i_dst.addr,
+ &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len);
+ rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len;
+ if (rt->rt6i_dst.plen == 128)
+ rt->u.dst.flags = DST_HOST;
+
+#ifdef CONFIG_IPV6_SUBTREES
+ ipv6_addr_prefix(&rt->rt6i_src.addr,
+ &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
+ rt->rt6i_src.plen = rtmsg->rtmsg_src_len;
+#endif
+
+ rt->rt6i_metric = rtmsg->rtmsg_metric;
+
+ /* We cannot add true routes via loopback here,
+ they would result in kernel looping; promote them to reject routes
+ */
+ if ((rtmsg->rtmsg_flags&RTF_REJECT) ||
+ (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
+ /* hold loopback dev/idev if we haven't done so. */
+ if (dev != &loopback_dev) {
+ if (dev) {
+ dev_put(dev);
+ in6_dev_put(idev);
+ }
+ dev = &loopback_dev;
+ dev_hold(dev);
+ idev = in6_dev_get(dev);
+ if (!idev) {
+ err = -ENODEV;
+ goto out;
+ }
+ }
+ rt->u.dst.output = ip6_pkt_discard_out;
+ rt->u.dst.input = ip6_pkt_discard;
+ rt->u.dst.error = -ENETUNREACH;
+ rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
+ goto install_route;
+ }
+
+ if (rtmsg->rtmsg_flags & RTF_GATEWAY) {
+ struct in6_addr *gw_addr;
+ int gwa_type;
+
+ gw_addr = &rtmsg->rtmsg_gateway;
+ ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway);
+ gwa_type = ipv6_addr_type(gw_addr);
+
+ if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
+ struct rt6_info *grt;
+
+ /* IPv6 strictly inhibits using not link-local
+ addresses as nexthop address.
+ Otherwise, router will not able to send redirects.
+ It is very good, but in some (rare!) circumstances
+ (SIT, PtP, NBMA NOARP links) it is handy to allow
+ some exceptions. --ANK
+ */
+ err = -EINVAL;
+ if (!(gwa_type&IPV6_ADDR_UNICAST))
+ goto out;
+
+ grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1);
+
+ err = -EHOSTUNREACH;
+ if (grt == NULL)
+ goto out;
+ if (dev) {
+ if (dev != grt->rt6i_dev) {
+ dst_release(&grt->u.dst);
+ goto out;
+ }
+ } else {
+ dev = grt->rt6i_dev;
+ idev = grt->rt6i_idev;
+ dev_hold(dev);
+ in6_dev_hold(grt->rt6i_idev);
+ }
+ if (!(grt->rt6i_flags&RTF_GATEWAY))
+ err = 0;
+ dst_release(&grt->u.dst);
+
+ if (err)
+ goto out;
+ }
+ err = -EINVAL;
+ if (dev == NULL || (dev->flags&IFF_LOOPBACK))
+ goto out;
+ }
+
+ err = -ENODEV;
+ if (dev == NULL)
+ goto out;
+
+ if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) {
+ rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
+ if (IS_ERR(rt->rt6i_nexthop)) {
+ err = PTR_ERR(rt->rt6i_nexthop);
+ rt->rt6i_nexthop = NULL;
+ goto out;
+ }
+ }
+
+ rt->rt6i_flags = rtmsg->rtmsg_flags;
+
+install_route:
+ if (rta && rta[RTA_METRICS-1]) {
+ int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]);
+ struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]);
+
+ while (RTA_OK(attr, attrlen)) {
+ unsigned flavor = attr->rta_type;
+ if (flavor) {
+ if (flavor > RTAX_MAX) {
+ err = -EINVAL;
+ goto out;
+ }
+ rt->u.dst.metrics[flavor-1] =
+ *(u32 *)RTA_DATA(attr);
+ }
+ attr = RTA_NEXT(attr, attrlen);
+ }
+ }
+
+ if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
+ rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
+ if (!rt->u.dst.metrics[RTAX_MTU-1])
+ rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
+ if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
+ rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
+ rt->u.dst.dev = dev;
+ rt->rt6i_idev = idev;
+ return ip6_ins_rt(rt, nlh, _rtattr);
+
+out:
+ if (dev)
+ dev_put(dev);
+ if (idev)
+ in6_dev_put(idev);
+ if (rt)
+ dst_free((struct dst_entry *) rt);
+ return err;
+}
+
+int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr)
+{
+ int err;
+
+ write_lock_bh(&rt6_lock);
+
+ rt6_reset_dflt_pointer(NULL);
+
+ err = fib6_del(rt, nlh, _rtattr);
+ dst_release(&rt->u.dst);
+
+ write_unlock_bh(&rt6_lock);
+
+ return err;
+}
+
+static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr)
+{
+ struct fib6_node *fn;
+ struct rt6_info *rt;
+ int err = -ESRCH;
+
+ read_lock_bh(&rt6_lock);
+
+ fn = fib6_locate(&ip6_routing_table,
+ &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len,
+ &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
+
+ if (fn) {
+ for (rt = fn->leaf; rt; rt = rt->u.next) {
+ if (rtmsg->rtmsg_ifindex &&
+ (rt->rt6i_dev == NULL ||
+ rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex))
+ continue;
+ if (rtmsg->rtmsg_flags&RTF_GATEWAY &&
+ !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway))
+ continue;
+ if (rtmsg->rtmsg_metric &&
+ rtmsg->rtmsg_metric != rt->rt6i_metric)
+ continue;
+ dst_hold(&rt->u.dst);
+ read_unlock_bh(&rt6_lock);
+
+ return ip6_del_rt(rt, nlh, _rtattr);
+ }
+ }
+ read_unlock_bh(&rt6_lock);
+
+ return err;
+}
+
+/*
+ * Handle redirects
+ */
+void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr,
+ struct neighbour *neigh, u8 *lladdr, int on_link)
+{
+ struct rt6_info *rt, *nrt;
+
+ /* Locate old route to this destination. */
+ rt = rt6_lookup(dest, NULL, neigh->dev->ifindex, 1);
+
+ if (rt == NULL)
+ return;
+
+ if (neigh->dev != rt->rt6i_dev)
+ goto out;
+
+ /*
+ * Current route is on-link; redirect is always invalid.
+ *
+ * Seems, previous statement is not true. It could
+ * be node, which looks for us as on-link (f.e. proxy ndisc)
+ * But then router serving it might decide, that we should
+ * know truth 8)8) --ANK (980726).
+ */
+ if (!(rt->rt6i_flags&RTF_GATEWAY))
+ goto out;
+
+ /*
+ * RFC 2461 specifies that redirects should only be
+ * accepted if they come from the nexthop to the target.
+ * Due to the way default routers are chosen, this notion
+ * is a bit fuzzy and one might need to check all default
+ * routers.
+ */
+ if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) {
+ if (rt->rt6i_flags & RTF_DEFAULT) {
+ struct rt6_info *rt1;
+
+ read_lock(&rt6_lock);
+ for (rt1 = ip6_routing_table.leaf; rt1; rt1 = rt1->u.next) {
+ if (ipv6_addr_equal(saddr, &rt1->rt6i_gateway)) {
+ dst_hold(&rt1->u.dst);
+ dst_release(&rt->u.dst);
+ read_unlock(&rt6_lock);
+ rt = rt1;
+ goto source_ok;
+ }
+ }
+ read_unlock(&rt6_lock);
+ }
+ if (net_ratelimit())
+ printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
+ "for redirect target\n");
+ goto out;
+ }
+
+source_ok:
+
+ /*
+ * We have finally decided to accept it.
+ */
+
+ neigh_update(neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_WEAK_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE|
+ (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
+ NEIGH_UPDATE_F_ISROUTER))
+ );
+
+ /*
+ * Redirect received -> path was valid.
+ * Look, redirects are sent only in response to data packets,
+ * so that this nexthop apparently is reachable. --ANK
+ */
+ dst_confirm(&rt->u.dst);
+
+ /* Duplicate redirect: silently ignore. */
+ if (neigh == rt->u.dst.neighbour)
+ goto out;
+
+ nrt = ip6_rt_copy(rt);
+ if (nrt == NULL)
+ goto out;
+
+ nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
+ if (on_link)
+ nrt->rt6i_flags &= ~RTF_GATEWAY;
+
+ ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
+ nrt->rt6i_dst.plen = 128;
+ nrt->u.dst.flags |= DST_HOST;
+
+ ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
+ nrt->rt6i_nexthop = neigh_clone(neigh);
+ /* Reset pmtu, it may be better */
+ nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
+ nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
+
+ if (ip6_ins_rt(nrt, NULL, NULL))
+ goto out;
+
+ if (rt->rt6i_flags&RTF_CACHE) {
+ ip6_del_rt(rt, NULL, NULL);
+ return;
+ }
+
+out:
+ dst_release(&rt->u.dst);
+ return;
+}
+
+/*
+ * Handle ICMP "packet too big" messages
+ * i.e. Path MTU discovery
+ */
+
+void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
+ struct net_device *dev, u32 pmtu)
+{
+ struct rt6_info *rt, *nrt;
+ int allfrag = 0;
+
+ rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
+ if (rt == NULL)
+ return;
+
+ if (pmtu >= dst_mtu(&rt->u.dst))
+ goto out;
+
+ if (pmtu < IPV6_MIN_MTU) {
+ /*
+ * According to RFC2460, PMTU is set to the IPv6 Minimum Link
+ * MTU (1280) and a fragment header should always be included
+ * after a node receiving Too Big message reporting PMTU is
+ * less than the IPv6 Minimum Link MTU.
+ */
+ pmtu = IPV6_MIN_MTU;
+ allfrag = 1;
+ }
+
+ /* New mtu received -> path was valid.
+ They are sent only in response to data packets,
+ so that this nexthop apparently is reachable. --ANK
+ */
+ dst_confirm(&rt->u.dst);
+
+ /* Host route. If it is static, it would be better
+ not to override it, but add new one, so that
+ when cache entry will expire old pmtu
+ would return automatically.
+ */
+ if (rt->rt6i_flags & RTF_CACHE) {
+ rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
+ if (allfrag)
+ rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
+ dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
+ rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
+ goto out;
+ }
+
+ /* Network route.
+ Two cases are possible:
+ 1. It is connected route. Action: COW
+ 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
+ */
+ if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
+ nrt = rt6_cow(rt, daddr, saddr);
+ if (!nrt->u.dst.error) {
+ nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
+ if (allfrag)
+ nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
+ /* According to RFC 1981, detecting PMTU increase shouldn't be
+ happened within 5 mins, the recommended timer is 10 mins.
+ Here this route expiration time is set to ip6_rt_mtu_expires
+ which is 10 mins. After 10 mins the decreased pmtu is expired
+ and detecting PMTU increase will be automatically happened.
+ */
+ dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
+ nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
+ }
+ dst_release(&nrt->u.dst);
+ } else {
+ nrt = ip6_rt_copy(rt);
+ if (nrt == NULL)
+ goto out;
+ ipv6_addr_copy(&nrt->rt6i_dst.addr, daddr);
+ nrt->rt6i_dst.plen = 128;
+ nrt->u.dst.flags |= DST_HOST;
+ nrt->rt6i_nexthop = neigh_clone(rt->rt6i_nexthop);
+ dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
+ nrt->rt6i_flags |= RTF_DYNAMIC|RTF_CACHE|RTF_EXPIRES;
+ nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
+ if (allfrag)
+ nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
+ ip6_ins_rt(nrt, NULL, NULL);
+ }
+
+out:
+ dst_release(&rt->u.dst);
+}
+
+/*
+ * Misc support functions
+ */
+
+static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
+{
+ struct rt6_info *rt = ip6_dst_alloc();
+
+ if (rt) {
+ rt->u.dst.input = ort->u.dst.input;
+ rt->u.dst.output = ort->u.dst.output;
+
+ memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
+ rt->u.dst.dev = ort->u.dst.dev;
+ if (rt->u.dst.dev)
+ dev_hold(rt->u.dst.dev);
+ rt->rt6i_idev = ort->rt6i_idev;
+ if (rt->rt6i_idev)
+ in6_dev_hold(rt->rt6i_idev);
+ rt->u.dst.lastuse = jiffies;
+ rt->rt6i_expires = 0;
+
+ ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
+ rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
+ rt->rt6i_metric = 0;
+
+ memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
+#ifdef CONFIG_IPV6_SUBTREES
+ memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
+#endif
+ }
+ return rt;
+}
+
+struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
+{
+ struct rt6_info *rt;
+ struct fib6_node *fn;
+
+ fn = &ip6_routing_table;
+
+ write_lock_bh(&rt6_lock);
+ for (rt = fn->leaf; rt; rt=rt->u.next) {
+ if (dev == rt->rt6i_dev &&
+ ipv6_addr_equal(&rt->rt6i_gateway, addr))
+ break;
+ }
+ if (rt)
+ dst_hold(&rt->u.dst);
+ write_unlock_bh(&rt6_lock);
+ return rt;
+}
+
+struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
+ struct net_device *dev)
+{
+ struct in6_rtmsg rtmsg;
+
+ memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
+ rtmsg.rtmsg_type = RTMSG_NEWROUTE;
+ ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
+ rtmsg.rtmsg_metric = 1024;
+ rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES;
+
+ rtmsg.rtmsg_ifindex = dev->ifindex;
+
+ ip6_route_add(&rtmsg, NULL, NULL);
+ return rt6_get_dflt_router(gwaddr, dev);
+}
+
+void rt6_purge_dflt_routers(void)
+{
+ struct rt6_info *rt;
+
+restart:
+ read_lock_bh(&rt6_lock);
+ for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) {
+ if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
+ dst_hold(&rt->u.dst);
+
+ rt6_reset_dflt_pointer(NULL);
+
+ read_unlock_bh(&rt6_lock);
+
+ ip6_del_rt(rt, NULL, NULL);
+
+ goto restart;
+ }
+ }
+ read_unlock_bh(&rt6_lock);
+}
+
+int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
+{
+ struct in6_rtmsg rtmsg;
+ int err;
+
+ switch(cmd) {
+ case SIOCADDRT: /* Add a route */
+ case SIOCDELRT: /* Delete a route */
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ err = copy_from_user(&rtmsg, arg,
+ sizeof(struct in6_rtmsg));
+ if (err)
+ return -EFAULT;
+
+ rtnl_lock();
+ switch (cmd) {
+ case SIOCADDRT:
+ err = ip6_route_add(&rtmsg, NULL, NULL);
+ break;
+ case SIOCDELRT:
+ err = ip6_route_del(&rtmsg, NULL, NULL);
+ break;
+ default:
+ err = -EINVAL;
+ }
+ rtnl_unlock();
+
+ return err;
+ };
+
+ return -EINVAL;
+}
+
+/*
+ * Drop the packet on the floor
+ */
+
+int ip6_pkt_discard(struct sk_buff *skb)
+{
+ IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
+ kfree_skb(skb);
+ return 0;
+}
+
+int ip6_pkt_discard_out(struct sk_buff *skb)
+{
+ skb->dev = skb->dst->dev;
+ return ip6_pkt_discard(skb);
+}
+
+/*
+ * Allocate a dst for local (unicast / anycast) address.
+ */
+
+struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
+ const struct in6_addr *addr,
+ int anycast)
+{
+ struct rt6_info *rt = ip6_dst_alloc();
+
+ if (rt == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ dev_hold(&loopback_dev);
+ in6_dev_hold(idev);
+
+ rt->u.dst.flags = DST_HOST;
+ rt->u.dst.input = ip6_input;
+ rt->u.dst.output = ip6_output;
+ rt->rt6i_dev = &loopback_dev;
+ rt->rt6i_idev = idev;
+ rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
+ rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
+ rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
+ rt->u.dst.obsolete = -1;
+
+ rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
+ if (!anycast)
+ rt->rt6i_flags |= RTF_LOCAL;
+ rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
+ if (rt->rt6i_nexthop == NULL) {
+ dst_free((struct dst_entry *) rt);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
+ rt->rt6i_dst.plen = 128;
+
+ atomic_set(&rt->u.dst.__refcnt, 1);
+
+ return rt;
+}
+
+static int fib6_ifdown(struct rt6_info *rt, void *arg)
+{
+ if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
+ rt != &ip6_null_entry) {
+ RT6_TRACE("deleted by ifdown %p\n", rt);
+ return -1;
+ }
+ return 0;
+}
+
+void rt6_ifdown(struct net_device *dev)
+{
+ write_lock_bh(&rt6_lock);
+ fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev);
+ write_unlock_bh(&rt6_lock);
+}
+
+struct rt6_mtu_change_arg
+{
+ struct net_device *dev;
+ unsigned mtu;
+};
+
+static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
+{
+ struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
+ struct inet6_dev *idev;
+
+ /* In IPv6 pmtu discovery is not optional,
+ so that RTAX_MTU lock cannot disable it.
+ We still use this lock to block changes
+ caused by addrconf/ndisc.
+ */
+
+ idev = __in6_dev_get(arg->dev);
+ if (idev == NULL)
+ return 0;
+
+ /* For administrative MTU increase, there is no way to discover
+ IPv6 PMTU increase, so PMTU increase should be updated here.
+ Since RFC 1981 doesn't include administrative MTU increase
+ update PMTU increase is a MUST. (i.e. jumbo frame)
+ */
+ /*
+ If new MTU is less than route PMTU, this new MTU will be the
+ lowest MTU in the path, update the route PMTU to reflect PMTU
+ decreases; if new MTU is greater than route PMTU, and the
+ old MTU is the lowest MTU in the path, update the route PMTU
+ to reflect the increase. In this case if the other nodes' MTU
+ also have the lowest MTU, TOO BIG MESSAGE will be lead to
+ PMTU discouvery.
+ */
+ if (rt->rt6i_dev == arg->dev &&
+ !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
+ (dst_mtu(&rt->u.dst) > arg->mtu ||
+ (dst_mtu(&rt->u.dst) < arg->mtu &&
+ dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
+ rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
+ rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
+ return 0;
+}
+
+void rt6_mtu_change(struct net_device *dev, unsigned mtu)
+{
+ struct rt6_mtu_change_arg arg;
+
+ arg.dev = dev;
+ arg.mtu = mtu;
+ read_lock_bh(&rt6_lock);
+ fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg);
+ read_unlock_bh(&rt6_lock);
+}
+
+static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta,
+ struct in6_rtmsg *rtmsg)
+{
+ memset(rtmsg, 0, sizeof(*rtmsg));
+
+ rtmsg->rtmsg_dst_len = r->rtm_dst_len;
+ rtmsg->rtmsg_src_len = r->rtm_src_len;
+ rtmsg->rtmsg_flags = RTF_UP;
+ if (r->rtm_type == RTN_UNREACHABLE)
+ rtmsg->rtmsg_flags |= RTF_REJECT;
+
+ if (rta[RTA_GATEWAY-1]) {
+ if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16))
+ return -EINVAL;
+ memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16);
+ rtmsg->rtmsg_flags |= RTF_GATEWAY;
+ }
+ if (rta[RTA_DST-1]) {
+ if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3))
+ return -EINVAL;
+ memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3));
+ }
+ if (rta[RTA_SRC-1]) {
+ if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3))
+ return -EINVAL;
+ memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3));
+ }
+ if (rta[RTA_OIF-1]) {
+ if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int)))
+ return -EINVAL;
+ memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
+ }
+ if (rta[RTA_PRIORITY-1]) {
+ if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4))
+ return -EINVAL;
+ memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
+ }
+ return 0;
+}
+
+int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
+{
+ struct rtmsg *r = NLMSG_DATA(nlh);
+ struct in6_rtmsg rtmsg;
+
+ if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
+ return -EINVAL;
+ return ip6_route_del(&rtmsg, nlh, arg);
+}
+
+int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
+{
+ struct rtmsg *r = NLMSG_DATA(nlh);
+ struct in6_rtmsg rtmsg;
+
+ if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
+ return -EINVAL;
+ return ip6_route_add(&rtmsg, nlh, arg);
+}
+
+struct rt6_rtnl_dump_arg
+{
+ struct sk_buff *skb;
+ struct netlink_callback *cb;
+};
+
+static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
+ struct in6_addr *dst,
+ struct in6_addr *src,
+ int iif,
+ int type, u32 pid, u32 seq,
+ struct nlmsghdr *in_nlh, int prefix)
+{
+ struct rtmsg *rtm;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+ struct rta_cacheinfo ci;
+
+ if (prefix) { /* user wants prefix routes only */
+ if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
+ /* success since this is not a prefix route */
+ return 1;
+ }
+ }
+
+ if (!pid && in_nlh) {
+ pid = in_nlh->nlmsg_pid;
+ }
+
+ nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*rtm));
+ rtm = NLMSG_DATA(nlh);
+ rtm->rtm_family = AF_INET6;
+ rtm->rtm_dst_len = rt->rt6i_dst.plen;
+ rtm->rtm_src_len = rt->rt6i_src.plen;
+ rtm->rtm_tos = 0;
+ rtm->rtm_table = RT_TABLE_MAIN;
+ if (rt->rt6i_flags&RTF_REJECT)
+ rtm->rtm_type = RTN_UNREACHABLE;
+ else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
+ rtm->rtm_type = RTN_LOCAL;
+ else
+ rtm->rtm_type = RTN_UNICAST;
+ rtm->rtm_flags = 0;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_protocol = rt->rt6i_protocol;
+ if (rt->rt6i_flags&RTF_DYNAMIC)
+ rtm->rtm_protocol = RTPROT_REDIRECT;
+ else if (rt->rt6i_flags & RTF_ADDRCONF)
+ rtm->rtm_protocol = RTPROT_KERNEL;
+ else if (rt->rt6i_flags&RTF_DEFAULT)
+ rtm->rtm_protocol = RTPROT_RA;
+
+ if (rt->rt6i_flags&RTF_CACHE)
+ rtm->rtm_flags |= RTM_F_CLONED;
+
+ if (dst) {
+ RTA_PUT(skb, RTA_DST, 16, dst);
+ rtm->rtm_dst_len = 128;
+ } else if (rtm->rtm_dst_len)
+ RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
+#ifdef CONFIG_IPV6_SUBTREES
+ if (src) {
+ RTA_PUT(skb, RTA_SRC, 16, src);
+ rtm->rtm_src_len = 128;
+ } else if (rtm->rtm_src_len)
+ RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
+#endif
+ if (iif)
+ RTA_PUT(skb, RTA_IIF, 4, &iif);
+ else if (dst) {
+ struct in6_addr saddr_buf;
+ if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
+ RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
+ }
+ if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
+ goto rtattr_failure;
+ if (rt->u.dst.neighbour)
+ RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
+ if (rt->u.dst.dev)
+ RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex);
+ RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric);
+ ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
+ if (rt->rt6i_expires)
+ ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies);
+ else
+ ci.rta_expires = 0;
+ ci.rta_used = rt->u.dst.__use;
+ ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
+ ci.rta_error = rt->u.dst.error;
+ ci.rta_id = 0;
+ ci.rta_ts = 0;
+ ci.rta_tsage = 0;
+ RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+static int rt6_dump_route(struct rt6_info *rt, void *p_arg)
+{
+ struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
+ int prefix;
+
+ if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) {
+ struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh);
+ prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
+ } else
+ prefix = 0;
+
+ return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
+ NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
+ NULL, prefix);
+}
+
+static int fib6_dump_node(struct fib6_walker_t *w)
+{
+ int res;
+ struct rt6_info *rt;
+
+ for (rt = w->leaf; rt; rt = rt->u.next) {
+ res = rt6_dump_route(rt, w->args);
+ if (res < 0) {
+ /* Frame is full, suspend walking */
+ w->leaf = rt;
+ return 1;
+ }
+ BUG_TRAP(res!=0);
+ }
+ w->leaf = NULL;
+ return 0;
+}
+
+static void fib6_dump_end(struct netlink_callback *cb)
+{
+ struct fib6_walker_t *w = (void*)cb->args[0];
+
+ if (w) {
+ cb->args[0] = 0;
+ fib6_walker_unlink(w);
+ kfree(w);
+ }
+ if (cb->args[1]) {
+ cb->done = (void*)cb->args[1];
+ cb->args[1] = 0;
+ }
+}
+
+static int fib6_dump_done(struct netlink_callback *cb)
+{
+ fib6_dump_end(cb);
+ return cb->done(cb);
+}
+
+int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct rt6_rtnl_dump_arg arg;
+ struct fib6_walker_t *w;
+ int res;
+
+ arg.skb = skb;
+ arg.cb = cb;
+
+ w = (void*)cb->args[0];
+ if (w == NULL) {
+ /* New dump:
+ *
+ * 1. hook callback destructor.
+ */
+ cb->args[1] = (long)cb->done;
+ cb->done = fib6_dump_done;
+
+ /*
+ * 2. allocate and initialize walker.
+ */
+ w = kmalloc(sizeof(*w), GFP_ATOMIC);
+ if (w == NULL)
+ return -ENOMEM;
+ RT6_TRACE("dump<%p", w);
+ memset(w, 0, sizeof(*w));
+ w->root = &ip6_routing_table;
+ w->func = fib6_dump_node;
+ w->args = &arg;
+ cb->args[0] = (long)w;
+ read_lock_bh(&rt6_lock);
+ res = fib6_walk(w);
+ read_unlock_bh(&rt6_lock);
+ } else {
+ w->args = &arg;
+ read_lock_bh(&rt6_lock);
+ res = fib6_walk_continue(w);
+ read_unlock_bh(&rt6_lock);
+ }
+#if RT6_DEBUG >= 3
+ if (res <= 0 && skb->len == 0)
+ RT6_TRACE("%p>dump end\n", w);
+#endif
+ res = res < 0 ? res : skb->len;
+ /* res < 0 is an error. (really, impossible)
+ res == 0 means that dump is complete, but skb still can contain data.
+ res > 0 dump is not complete, but frame is full.
+ */
+ /* Destroy walker, if dump of this table is complete. */
+ if (res <= 0)
+ fib6_dump_end(cb);
+ return res;
+}
+
+int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ int iif = 0;
+ int err = -ENOBUFS;
+ struct sk_buff *skb;
+ struct flowi fl;
+ struct rt6_info *rt;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (skb == NULL)
+ goto out;
+
+ /* Reserve room for dummy headers, this skb can pass
+ through good chunk of routing engine.
+ */
+ skb->mac.raw = skb->data;
+ skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
+
+ memset(&fl, 0, sizeof(fl));
+ if (rta[RTA_SRC-1])
+ ipv6_addr_copy(&fl.fl6_src,
+ (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1]));
+ if (rta[RTA_DST-1])
+ ipv6_addr_copy(&fl.fl6_dst,
+ (struct in6_addr*)RTA_DATA(rta[RTA_DST-1]));
+
+ if (rta[RTA_IIF-1])
+ memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
+
+ if (iif) {
+ struct net_device *dev;
+ dev = __dev_get_by_index(iif);
+ if (!dev) {
+ err = -ENODEV;
+ goto out_free;
+ }
+ }
+
+ fl.oif = 0;
+ if (rta[RTA_OIF-1])
+ memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
+
+ rt = (struct rt6_info*)ip6_route_output(NULL, &fl);
+
+ skb->dst = &rt->u.dst;
+
+ NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
+ err = rt6_fill_node(skb, rt,
+ &fl.fl6_dst, &fl.fl6_src,
+ iif,
+ RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
+ nlh->nlmsg_seq, nlh, 0);
+ if (err < 0) {
+ err = -EMSGSIZE;
+ goto out_free;
+ }
+
+ err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
+ if (err > 0)
+ err = 0;
+out:
+ return err;
+out_free:
+ kfree_skb(skb);
+ goto out;
+}
+
+void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh)
+{
+ struct sk_buff *skb;
+ int size = NLMSG_SPACE(sizeof(struct rtmsg)+256);
+
+ skb = alloc_skb(size, gfp_any());
+ if (!skb) {
+ netlink_set_err(rtnl, 0, RTMGRP_IPV6_ROUTE, ENOBUFS);
+ return;
+ }
+ if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, 0, 0, nlh, 0) < 0) {
+ kfree_skb(skb);
+ netlink_set_err(rtnl, 0, RTMGRP_IPV6_ROUTE, EINVAL);
+ return;
+ }
+ NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_ROUTE;
+ netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_ROUTE, gfp_any());
+}
+
+/*
+ * /proc
+ */
+
+#ifdef CONFIG_PROC_FS
+
+#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
+
+struct rt6_proc_arg
+{
+ char *buffer;
+ int offset;
+ int length;
+ int skip;
+ int len;
+};
+
+static int rt6_info_route(struct rt6_info *rt, void *p_arg)
+{
+ struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;
+ int i;
+
+ if (arg->skip < arg->offset / RT6_INFO_LEN) {
+ arg->skip++;
+ return 0;
+ }
+
+ if (arg->len >= arg->length)
+ return 0;
+
+ for (i=0; i<16; i++) {
+ sprintf(arg->buffer + arg->len, "%02x",
+ rt->rt6i_dst.addr.s6_addr[i]);
+ arg->len += 2;
+ }
+ arg->len += sprintf(arg->buffer + arg->len, " %02x ",
+ rt->rt6i_dst.plen);
+
+#ifdef CONFIG_IPV6_SUBTREES
+ for (i=0; i<16; i++) {
+ sprintf(arg->buffer + arg->len, "%02x",
+ rt->rt6i_src.addr.s6_addr[i]);
+ arg->len += 2;
+ }
+ arg->len += sprintf(arg->buffer + arg->len, " %02x ",
+ rt->rt6i_src.plen);
+#else
+ sprintf(arg->buffer + arg->len,
+ "00000000000000000000000000000000 00 ");
+ arg->len += 36;
+#endif
+
+ if (rt->rt6i_nexthop) {
+ for (i=0; i<16; i++) {
+ sprintf(arg->buffer + arg->len, "%02x",
+ rt->rt6i_nexthop->primary_key[i]);
+ arg->len += 2;
+ }
+ } else {
+ sprintf(arg->buffer + arg->len,
+ "00000000000000000000000000000000");
+ arg->len += 32;
+ }
+ arg->len += sprintf(arg->buffer + arg->len,
+ " %08x %08x %08x %08x %8s\n",
+ rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
+ rt->u.dst.__use, rt->rt6i_flags,
+ rt->rt6i_dev ? rt->rt6i_dev->name : "");
+ return 0;
+}
+
+static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
+{
+ struct rt6_proc_arg arg;
+ arg.buffer = buffer;
+ arg.offset = offset;
+ arg.length = length;
+ arg.skip = 0;
+ arg.len = 0;
+
+ read_lock_bh(&rt6_lock);
+ fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg);
+ read_unlock_bh(&rt6_lock);
+
+ *start = buffer;
+ if (offset)
+ *start += offset % RT6_INFO_LEN;
+
+ arg.len -= offset % RT6_INFO_LEN;
+
+ if (arg.len > length)
+ arg.len = length;
+ if (arg.len < 0)
+ arg.len = 0;
+
+ return arg.len;
+}
+
+extern struct rt6_statistics rt6_stats;
+
+static int rt6_stats_seq_show(struct seq_file *seq, void *v)
+{
+ seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
+ rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
+ rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
+ rt6_stats.fib_rt_cache,
+ atomic_read(&ip6_dst_ops.entries),
+ rt6_stats.fib_discarded_routes);
+
+ return 0;
+}
+
+static int rt6_stats_seq_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, rt6_stats_seq_show, NULL);
+}
+
+static struct file_operations rt6_stats_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = rt6_stats_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+#endif /* CONFIG_PROC_FS */
+
+#ifdef CONFIG_SYSCTL
+
+static int flush_delay;
+
+static
+int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ if (write) {
+ proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
+ fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
+ return 0;
+ } else
+ return -EINVAL;
+}
+
+ctl_table ipv6_route_table[] = {
+ {
+ .ctl_name = NET_IPV6_ROUTE_FLUSH,
+ .procname = "flush",
+ .data = &flush_delay,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &ipv6_sysctl_rtcache_flush
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
+ .procname = "gc_thresh",
+ .data = &ip6_dst_ops.gc_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
+ .procname = "max_size",
+ .data = &ip6_rt_max_size,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
+ .procname = "gc_min_interval",
+ .data = &ip6_rt_gc_min_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
+ .procname = "gc_timeout",
+ .data = &ip6_rt_gc_timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
+ .procname = "gc_interval",
+ .data = &ip6_rt_gc_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
+ .procname = "gc_elasticity",
+ .data = &ip6_rt_gc_elasticity,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
+ .procname = "mtu_expires",
+ .data = &ip6_rt_mtu_expires,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
+ .procname = "min_adv_mss",
+ .data = &ip6_rt_min_advmss,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
+ .procname = "gc_min_interval_ms",
+ .data = &ip6_rt_gc_min_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_ms_jiffies,
+ .strategy = &sysctl_ms_jiffies,
+ },
+ { .ctl_name = 0 }
+};
+
+#endif
+
+void __init ip6_route_init(void)
+{
+ struct proc_dir_entry *p;
+
+ ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache",
+ sizeof(struct rt6_info),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+ if (!ip6_dst_ops.kmem_cachep)
+ panic("cannot create ip6_dst_cache");
+
+ fib6_init();
+#ifdef CONFIG_PROC_FS
+ p = proc_net_create("ipv6_route", 0, rt6_proc_info);
+ if (p)
+ p->owner = THIS_MODULE;
+
+ proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
+#endif
+#ifdef CONFIG_XFRM
+ xfrm6_init();
+#endif
+}
+
+void ip6_route_cleanup(void)
+{
+#ifdef CONFIG_PROC_FS
+ proc_net_remove("ipv6_route");
+ proc_net_remove("rt6_stats");
+#endif
+#ifdef CONFIG_XFRM
+ xfrm6_fini();
+#endif
+ rt6_ifdown(NULL);
+ fib6_gc_cleanup();
+ kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
+}